Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966).
Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped;
often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species: Cell body broad ovoidal or nearly circular, broad longitudinal furrow present,
13-20 (-23) μm long, 12-15 μm wide;
anterior broadly rounded, posterior slightly pointed; pellicle with longitudinal striae;
1-2 paramylon bodies disc-shaped
(Photomicrographs of the Freshwater Algae, 1995).
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